Sintering ignition gas regulation intelligent control model based on disturbance compensation

Abstract

The invention provides a sintering ignition gas regulation intelligent control model based on disturbance compensation, and the model comprises the following steps: S1, comparing a sintering ignition hearth temperature reference value with an actual hearth temperature detection value, and judging whether the two values are consistent or not; s2, calculating the increase and decrease amount of the coal gas flow through a hearth temperature controller; s3, the adjustment amount of gas compensation is calculated, and the total adjustment amount of gas is calculated by combining and superposing the calculation result of the S2 through disturbance factors; s4, comparing the gas flow change value calculated in the step S3 with the actual gas flow to judge whether the gas flow change value is consistent with the actual gas flow; s5, the variable quantity of the opening degree of the gas adjusting valve is calculated through a gas flow controller; and S6, adjusting the gas valve to a target value, and entering next calculation. Compared with traditional sintering production ignition gas control, the automatic and intelligent level is higher, the workload of operators is relieved, meanwhile, the stability of the sintering production ignition temperature is improved, the usage amount of gas is reduced, and the sintering production cost is reduced.

Description

Technical Field

[0001] The present invention relates to a sintering ignition gas flow rate regulation and control technology for a sintering machine in the iron and steel metallurgical industry, and in particular to a sintering ignition gas regulation intelligent control model based on disturbance compensation. Background Art

[0002] At present, steel is the main raw material for industrial production, and the steel industry is an important basic industry. Iron ore sintering is an important production link in ironmaking, and the sintered ore produced is the main raw material for blast furnace ironmaking. The iron ore sintering production process mainly includes batching, mixing and granulation, material distribution, ignition, sintering, ventilation, cooling, crushing and screening. Among them, sintering ignition is an important process in the sintering process and the starting point of the entire combustion process. The function of sintering ignition is mainly to provide heat for the sintering process, ignite the material on the surface of the material layer, and under the action of exhaust, gradually burn vertically below the material layer to make the sintered ore bonded into blocks.

[0003] Most of the existing sintering machine ignition control methods use fixed valve opening or simple PID flow control methods. During use, due to the fluctuation of gas conditions and the change of operating process parameters, the ignition gas will not burn fully, thus increasing the sintering production cost. Therefore, it is very necessary to develop a new sintering ignition gas flow control model. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and propose a sintering ignition gas regulation intelligent control model based on disturbance compensation, aiming to improve the stability of the sintering production ignition temperature, reduce the use of gas, and reduce the sintering production cost.

[0005] To achieve the above purpose, the present invention adopts the following technical solution: a sintering ignition gas regulation intelligent control model based on disturbance compensation, comprising the following sub-steps: S1: Compare the sintering ignition furnace temperature reference value with the actual furnace temperature detection value to determine whether the two are consistent, and then proceed to step S2; The sintering ignition furnace temperature reference value is the furnace temperature reference value, the sintering ignition furnace temperature range is between 900-1200°C, and the furnace temperature reference value is 1050°C; The actual furnace temperature detection value is measured by a temperature detector in the furnace; S11: If the actual furnace temperature detection value is 1050°C and the temperature difference is 0°C, proceed to step S21; S12: If the actual furnace temperature detection value is not 1050°C, calculate the temperature difference and proceed to step S22; S2: Calculate the increase or decrease of gas flow rate through the furnace temperature controller; A furnace temperature controller is provided outside the furnace, and the furnace temperature controller also includes a set of calculation methods, which are as follows: S21: If the temperature difference is 0°C, the gas flow rate is not adjusted; S22: If there is a temperature difference, the gas flow rate is reduced by 500m3 based on the current value when the actual furnace temperature is 5°C higher than the reference temperature. 3 / h, when the actual furnace temperature is 5℃ lower than the reference temperature, the gas flow rate will increase by 500m / h on the current basis. 3 / h for calculation; S3: Calculate the adjustment amount of gas compensation, calculate the total adjustment amount of gas by combining the disturbance factor and the calculation result of S2, and then enter step S4; The disturbance factors include gas pressure, exhaust negative pressure and sintering machine speed; The gas pressure and gas flow are positively correlated, and the square value of the gas flow Q 2 It is linearly related to the gas pressure P. Through this relationship, the gas compensation amount under the current pressure condition is calculated using the historical fitting formula; the fitting formula is: Q 2 =a×P+b (a, b are constants, calculated based on historical data fitting); The measured value of the sintering exhaust negative pressure P1 is used to perform gas flow compensation calculation according to the calculation formula to obtain the gas adjustment amount and perform positive compensation on the gas flow; the calculation formula is Q=c×P1+d (c, d are constants, calculated based on historical data fitting); The sintering machine speed is adjusted by 0.01m / min, and the corresponding gas flow rate is adjusted by 50m³ / h. The speed range is 1.0-1.5m / min, with 1.25m / min as the reference value. If it is higher than the reference value, the gas flow rate is increased, and if it is lower than the reference value, the gas flow rate is reduced. If it is lower than 1.0m / min, no adjustment is made; S4: Compare the gas flow rate change value calculated in S3 with the actual gas flow rate to determine whether they are consistent, and proceed to step S5; The actual gas flow is measured by a gas flow detector in the furnace; S41: If the gas flow change value is equal to the actual gas flow, the gas flow change is 0m 3 / h, go to step S51; S42: If the gas flow rate change value is not equal to the actual gas flow rate, calculate the gas flow rate change and proceed to step S52; S5: Calculate the change in the opening of the gas regulating valve through the gas flow controller, and proceed to step S6; The gas flow controller is arranged outside the furnace, and the gas flow controller also includes a set of calculation methods, which are as follows: S51: If the gas flow change value is 0, the valve opening does not change; S52: If the gas flow rate change value is not 0, the gas flow rate is increased by 500m 3 / h, the valve opening increases by 0.5%, and the gas flow rate decreases by 500m 3 / h, the valve opening is reduced by 0.5% for calculation, and the process goes to step S6; S6: Adjust the gas valve to the target value and enter the next calculation; Preferably, after step S6 is completed, the process can return to step S1 to calculate and control again, and repeat steps S1-S6 until the target value is reached.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention quantitatively compensates for the disturbance factors that affect the sintering ignition gas consumption, and realizes precise control of the gas flow rate through the furnace temperature controller and the gas flow controller respectively, thereby achieving stable furnace ignition temperature, thereby achieving the goal of precisely controlling the ignition gas consumption and operating under optimal operating conditions, thereby achieving full combustion of the sintering ignition gas, reducing the sintering ignition gas consumption and reducing the production cost of the sintering process, and stabilizing the ignition furnace temperature to achieve stable control of product quality; (2) The problem that the ignition effect cannot be precisely controlled during the sintering machine ignition process due to fluctuations in operating conditions and changes in operating parameters is solved; (3) By precisely controlling the sintering ignition gas flow rate, the system can be burned under stable conditions, reducing gas consumption and achieving the goals of energy conservation, emission reduction, cost reduction and efficiency improvement. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 The present invention is a flowchart of the steps of a sintering ignition gas regulation intelligent control model based on disturbance compensation. DETAILED DESCRIPTION

[0008] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0009] Please refer to Figure 1 The present invention provides a sintering ignition gas regulation intelligent control model based on disturbance compensation, comprising the following sub-steps: S1: Compare the sintering ignition furnace temperature reference value with the actual furnace temperature detection value to determine whether the two are consistent, and then proceed to step S2; The sintering ignition furnace temperature reference value is the furnace temperature reference value, the sintering ignition furnace temperature range is between 900-1200°C, and the furnace temperature reference value is 1050°C; The actual furnace temperature detection value is measured by a temperature detector in the furnace; S11: If the actual furnace temperature detection value is 1050°C and the temperature difference is 0°C, proceed to step S21; S12: If the actual furnace temperature detection value is not 1050°C, calculate the temperature difference and proceed to step S22; S2: Calculate the increase or decrease of gas flow rate through the furnace temperature controller; A furnace temperature controller is provided outside the furnace, and the furnace temperature controller also includes a set of calculation methods, which are as follows: S21: If the temperature difference is 0°C, the gas flow rate is not adjusted; S22: If there is a temperature difference, the gas flow rate is reduced by 500m3 based on the current value when the actual furnace temperature is 5°C higher than the reference temperature. 3 / h, when the actual furnace temperature is 5℃ lower than the reference temperature, the gas flow rate will increase by 500m / h on the current basis. 3 / h for calculation; S3: Calculate the adjustment amount of gas compensation, calculate the total adjustment amount of gas by combining the disturbance factor and the calculation result of S2, and then enter step S4; The disturbance factors include gas pressure, exhaust negative pressure and sintering machine speed; The gas pressure and gas flow are positively correlated, and the square value of the gas flow Q 2 It is linearly related to the gas pressure P. Through this relationship, the gas compensation amount under the current pressure condition is calculated using the historical fitting formula; the fitting formula is: Q 2 =a×P+b (a, b are constants, calculated based on historical data fitting); The measured value of the sintering exhaust negative pressure P1 is used to perform gas flow compensation calculation according to the calculation formula to obtain the gas adjustment amount and perform positive compensation on the gas flow; the calculation formula is Q=c×P1+d (c, d are constants, calculated based on historical data fitting); The sintering machine speed is adjusted by 0.01m / min, and the corresponding gas flow rate is adjusted by 50m³ / h. The speed range is 1.0-1.5m / min, with 1.25m / min as the reference value. When it is higher than the reference value, the gas flow rate is increased, and when it is lower than the reference value, the gas flow rate is reduced. When it is lower than 1.0m / min, no adjustment is made. When the sintering machine speed increases and the ignition intensity decreases, the intelligent control model automatically reversely compensates for the ignition intensity and increases the gas volume. On the contrary, when the sintering machine speed decreases and the ignition intensity increases, the intelligent control model automatically reversely compensates for the ignition intensity and reduces the gas volume. S4: Compare the gas flow rate change value calculated in S3 with the actual gas flow rate to determine whether they are consistent, and proceed to step S5; The actual gas flow is measured by a gas flow detector in the furnace; S41: If the gas flow change value is equal to the actual gas flow, the gas flow change is 0m 3 / h, go to step S51; S42: If the gas flow rate change value is not equal to the actual gas flow rate, calculate the gas flow rate change and proceed to step S52; S5: Calculate the change in the opening of the gas regulating valve through the gas flow controller, and proceed to step S6; The gas flow controller is arranged outside the furnace, and the gas flow controller also includes a set of calculation methods, which are as follows: S51: If the gas flow change value is 0, the valve opening does not change; S52: If the gas flow rate change value is not 0, the gas flow rate is increased by 500m 3 / h, the valve opening increases by 0.5%, and the gas flow rate decreases by 500m 3 / h, the valve opening is reduced by 0.5% for calculation, and the process goes to step S6; S6: Adjust the gas valve to the target value and enter the next calculation; Preferably, after step S6 is completed, the process can return to step S1 to calculate and control again, and repeat steps S1-S6 until the target value is reached.

[0010] In one embodiment, if Figure 1 As shown, the sintering ignition furnace temperature range of the embodiment is between 900-1200°C, and its reference value is 1050°C; the gas pressure P ranges from 6000 to 15000Pa; the exhaust negative pressure P1 ranges from -5 to -8kPa; the sintering machine speed ranges from 1.0 to 1.5m / min, with 1.25m / min as the reference value.

[0011] Step 1: For every 5°C the furnace temperature exceeds the base temperature, the gas flow rate increases by 500m 3 / h, for every 5℃ below, the gas flow rate will decrease by 500m 3 / h, calculate the required gas adjustment amount Q1; Step 2: According to the current gas pressure P, the formula Q 2 =2.77P+1.039×10 8 , calculate the required flow rate Q, and make a difference calculation with the detected flow rate to obtain the value Q2; Step 3: According to the current exhaust negative pressure P1, the required flow rate Q is calculated by the embodiment formula Q=96.84P1+8776.16, and the difference is calculated with the detected flow rate to obtain the value Q3; Step 4: Every time the sintering machine speed is adjusted by 0.01m / min, the corresponding gas flow rate is adjusted by 50m³ / h. When the sintering machine speed range is higher than the reference value, the gas flow rate is increased; when it is lower than the reference value, the gas flow rate is reduced; when it is lower than 1.0m / min, no further adjustment is made; calculate the required gas adjustment amount Q4; Step 5: Add the calculated values ​​of steps 1 to 4 of the above embodiment, i.e., Q1+Q2+Q3+Q4, to obtain the total adjustment amount Q5.

[0012] Step 6: When Q5>0, increase the gas regulating valve opening and the gas flow rate increases by 500m 3 / h, the valve opening increases by 0.5%; when Q5=0, the gas regulating valve opening remains unchanged; when Q5<0, the gas regulating valve opening is reduced, and the gas flow rate decreases by 500m 3 / h, the valve opening decreases by 0.5%.

[0013] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A sintering ignition gas regulation intelligent control model based on disturbance compensation, characterized in that: The following steps are involved: S1: Compare the sintering ignition furnace temperature reference value with the actual furnace temperature detection value to determine whether the two are consistent, and then proceed to step S2; The sintering ignition furnace temperature reference value is the furnace temperature reference value, the sintering ignition furnace temperature range is between 900-1200°C, and the furnace temperature reference value is 1050°C; The actual furnace temperature detection value is measured by a temperature detector in the furnace; S2: Calculate the increase or decrease of gas flow rate through the furnace temperature controller; A furnace temperature controller is provided outside the furnace, and the furnace temperature controller also includes a set of calculation methods; The calculation method of the furnace temperature controller is: when the actual furnace temperature is 5°C higher than the reference temperature, the gas flow rate is reduced by 500m 3 / h, when the actual furnace temperature is 5℃ lower than the reference temperature, the gas flow rate will increase by 500m / h on the current basis. 3 / h; S3: Calculate the adjustment amount of gas compensation, calculate the total adjustment amount of gas by combining the disturbance factor and the calculation result of S2, and then enter step S4; The disturbance factors include gas pressure, exhaust negative pressure and sintering machine speed; The gas pressure and gas flow are positively correlated, and the square value of the gas flow Q 2 It is linearly related to the gas pressure P. Through this relationship, the gas compensation amount under the current pressure condition is calculated using the historical fitting formula; the fitting formula is: Q 2 =a×P+b (a, b are constants, calculated based on historical data fitting); The measured value of the sintering exhaust negative pressure P1 is used to perform gas flow compensation calculation according to the calculation formula to obtain the gas adjustment amount and perform positive compensation on the gas flow; the calculation formula is Q=c×P1+d (c, d are constants, calculated based on historical data fitting); The sintering machine speed is adjusted by 0.01m / min, and the corresponding gas flow rate is adjusted by 50m³ / h. The speed range is 1.0-1.5m / min, with 1.25m / min as the reference value. If it is higher than the reference value, the gas flow rate is increased, and if it is lower than the reference value, the gas flow rate is reduced. If it is lower than 1.0m / min, no adjustment is made; S4: Compare the gas flow rate change value calculated in S3 with the actual gas flow rate to determine whether they are consistent, and proceed to step S5; The actual gas flow is measured by a gas flow detector in the furnace; S5: Calculate the change in the opening of the gas regulating valve through the gas flow controller, and proceed to step S6; The gas flow controller is arranged outside the furnace, and the gas flow controller also includes a set of calculation methods; The calculation method of the gas flow controller: the gas flow increases by 500m 3 / h, the valve opening increases by 0.5%, and the gas flow rate decreases by 500m 3 / h, the valve opening decreases by 0.5%; S6: Adjust the gas valve to the target value and enter the next calculation.

2. The sintering ignition gas regulation intelligent control model based on disturbance compensation as claimed in claim 1, characterized in that: Step S1 includes the following sub-steps: S11: If the actual furnace temperature detection value is 1050°C and the temperature difference is 0°C, proceed to step S21; S12: If the actual furnace temperature detection value is not 1050°C, calculate the temperature difference and enter step S22.

3. The sintering ignition gas regulation intelligent control model based on disturbance compensation as claimed in claim 1, characterized in that: Step S2 includes the following sub-steps: S21: If the temperature difference is 0°C, the gas flow rate is not adjusted; S22: If there is a temperature difference, the gas flow rate is reduced by 500m3 based on the current value when the actual furnace temperature is 5°C higher than the reference temperature. 3 / h, when the actual furnace temperature is 5℃ lower than the reference temperature, the gas flow rate will increase by 500m / h on the current basis. 3 / h for calculation.

4. The sintering ignition gas regulation intelligent control model based on disturbance compensation as claimed in claim 1, characterized in that: Step S4 includes the following sub-steps: S41: If the gas flow change value is equal to the actual gas flow, the gas flow change is 0m 3 / h, go to step S51; S42: If the gas flow rate change value is not equal to the actual gas flow rate, calculate the gas flow rate change and proceed to step S52.

5. The sintering ignition gas regulation intelligent control model based on disturbance compensation as claimed in claim 1, characterized in that: Step S5 includes the following sub-steps: S51: If the gas flow change value is 0, the valve opening does not change; S52: If the gas flow rate change value is not 0, the gas flow rate is increased by 500m 3 / h, the valve opening increases by 0.5%, and the gas flow rate decreases by 500m 3 / h, the valve opening is reduced by 0.5% for calculation and the process goes to step S6.

6. The sintering ignition gas regulation intelligent control model based on disturbance compensation as claimed in claim 1, characterized in that: After step S6 is completed, the process can return to step S1 to calculate and control again, and repeat steps S1-S6 until the target value is reached.

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